Affiliations: [a] Department of Electrical Engineering, Dong-A University, Busan, Korea | [b] R&D Center, Power & Industrial Systems Performance Group, HYOSUNG Corporation, Changwon, Korea | [c] R&D Center, Korea Electrotechnology Research Institute, Changwon, Korea
Correspondence:
[*]
Corresponding author: Sung-Chin Hahn, Department of Electrical Engineering, Dong-A University, 604-714 Busan, Korea. E-mail:schahn@dau.ac.kr
Abstract: A power transformer has complex geometry comparing with
other electric machines. So it needs a lot of computing time when we deal
with the transient problem such as short-circuit characteristics of a power
transformer. In this paper, we proposed an efficient numerical technique to
compute transient electromagnetic force of a power transformer during
three-phase short-circuit condition. In order to analyze the transient
electromagnetic force acting on every disk of transformer windings, we made
a simplified axi-symmetric model. First, the transient short-circuit current
is calculated by using a short-circuit equation. Next, the transient
short-circuit electromagnetic force due to the short-circuit current is
computed by finite element method with a simplified axi-symmetric model. The
proposed numerical technique is expected to be useful in the short-circuit
duty design and structure design of the power transformers.
Keywords: Numerical modeling, short-circuit electromagnetic force, short-circuit characteristic, power transformer
